From patchwork Fri Mar 6 15:18:41 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arend van Spriel X-Patchwork-Id: 5955671 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: X-Original-To: patchwork-linux-wireless@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 814B19F380 for ; Fri, 6 Mar 2015 15:18:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BE2CA2018E for ; Fri, 6 Mar 2015 15:18:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D891200E8 for ; Fri, 6 Mar 2015 15:18:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756161AbbCFPSr (ORCPT ); Fri, 6 Mar 2015 10:18:47 -0500 Received: from mail-gw1-out.broadcom.com ([216.31.210.62]:12856 "EHLO mail-gw1-out.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755235AbbCFPSq (ORCPT ); Fri, 6 Mar 2015 10:18:46 -0500 X-IronPort-AV: E=Sophos;i="5.11,353,1422950400"; d="scan'208";a="58944631" Received: from irvexchcas08.broadcom.com (HELO IRVEXCHCAS08.corp.ad.broadcom.com) ([10.9.208.57]) by mail-gw1-out.broadcom.com with ESMTP; 06 Mar 2015 09:53:14 -0800 Received: from IRVEXCHSMTP2.corp.ad.broadcom.com (10.9.207.52) by IRVEXCHCAS08.corp.ad.broadcom.com (10.9.208.57) with Microsoft SMTP Server (TLS) id 14.3.174.1; Fri, 6 Mar 2015 07:18:45 -0800 Received: from mail-sj1-12.sj.broadcom.com (10.10.10.20) by IRVEXCHSMTP2.corp.ad.broadcom.com (10.9.207.52) with Microsoft SMTP Server id 14.3.174.1; Fri, 6 Mar 2015 07:18:45 -0800 Received: from lb-bun-235.bun.broadcom.com (lb-bun-235.bun.broadcom.com [10.176.8.235]) by mail-sj1-12.sj.broadcom.com (Postfix) with ESMTP id 772A427A82; Fri, 6 Mar 2015 07:18:45 -0800 (PST) Received: from arend by lb-bun-235.bun.broadcom.com with local (Exim 4.82) (envelope-from ) id 1YTu1U-0004vj-Ei; Fri, 06 Mar 2015 16:18:44 +0100 From: Arend van Spriel To: Kalle Valo CC: linux-wireless , Pontus Fuchs , Arend van Spriel Subject: [PATCH] brcmfmac: Perform bound checking on vendor command buffer Date: Fri, 6 Mar 2015 16:18:41 +0100 Message-ID: <1425655123-18916-1-git-send-email-arend@broadcom.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Pontus Fuchs A short or malformed vendor command buffer could cause reads outside the command buffer. Cc: stable@vger.kernel.org # v3.19 Signed-off-by: Pontus Fuchs [arend@broadcom.com: slightly modified debug trace output] Signed-off-by: Arend van Spriel --- drivers/net/wireless/brcm80211/brcmfmac/vendor.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/brcm80211/brcmfmac/vendor.c b/drivers/net/wireless/brcm80211/brcmfmac/vendor.c index 50cdf70..8eff275 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/vendor.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/vendor.c @@ -39,13 +39,22 @@ static int brcmf_cfg80211_vndr_cmds_dcmd_handler(struct wiphy *wiphy, void *dcmd_buf = NULL, *wr_pointer; u16 msglen, maxmsglen = PAGE_SIZE - 0x100; - brcmf_dbg(TRACE, "cmd %x set %d len %d\n", cmdhdr->cmd, cmdhdr->set, - cmdhdr->len); + if (len < sizeof(*cmdhdr)) { + brcmf_err("vendor command too short: %d\n", len); + return -EINVAL; + } vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev); ifp = vif->ifp; - len -= sizeof(struct brcmf_vndr_dcmd_hdr); + brcmf_dbg(TRACE, "ifidx=%d, cmd=%d\n", ifp->ifidx, cmdhdr->cmd); + + if (cmdhdr->offset > len) { + brcmf_err("bad buffer offset %d > %d\n", cmdhdr->offset, len); + return -EINVAL; + } + + len -= cmdhdr->offset; ret_len = cmdhdr->len; if (ret_len > 0 || len > 0) { if (len > BRCMF_DCMD_MAXLEN) {